61820681167 has 4 divisors (see below), whose sum is σ = 70652207056. Its totient is φ = 52989155280.

The previous prime is 61820681161. The next prime is 61820681171. The reversal of 61820681167 is 76118602816.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61820681167 - 2¹⁵ = 61820648399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61820681161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4415762934 + ... + 4415762947.

It is an arithmetic number, because the mean of its divisors is an integer number (17663051764).

Almost surely, 2^61820681167 is an apocalyptic number.

61820681167 is a deficient number, since it is larger than the sum of its proper divisors (8831525889).

61820681167 is an equidigital number, since it uses as much as digits as its factorization.

61820681167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8831525888.

The product of its (nonzero) digits is 193536, while the sum is 46.

The spelling of 61820681167 in words is "sixty-one billion, eight hundred twenty million, six hundred eighty-one thousand, one hundred sixty-seven".